The 4383998 Differential Pressure Sensor is a high-precision component engineered for automotive and heavy-duty industrial emission control systems. Primarily utilized to monitor the efficiency of the Diesel Particulate Filter (DPF), this sensor accurately measures the pressure variance between the upstream and downstream exhaust gas flow. It features a robust black plastic housing designed to withstand harsh under-hood environments and high temperatures. The unit is equipped with two dedicated hose barbs designated ‘HI’ and ‘LO’ for accurate pressure routing, alongside a secure 4-pin electrical connector for reliable data transmission to the engine control module. To ensure optimal functionality and prevent internal condensation buildup, the sensor includes molded mounting guidelines indicating ‘MOUNT VERTICALLY’ and ‘THIS END UP’.